System Overview: Signals

The tables below summarize the input and output signals to the units in the system for the alarm. The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication.

CENTRAL ELECTRONIC MODULE (CEM) (4/56):

Input signals	Output signals
Directly connected:	Directly connected:
Reduced alarm switch (3/174) for disconnecting the vehicle tilt sensor, Mass movement sensor module (MMS) (7/122, 7/158), alternatively ultrasonic sensor module (IMS) (7/199) and deadlock mode. Driver's door open sensor to indicate when the door is open (3/74) Passenger door open sensor to indicate when the door is open (3/75) Tailgate/trunk lid open sensor to indicate when the tailgate/trunk is open (3/78) Hood open sensor to indicate when the hood is open (3/62). Glass breakage loop in rear window (7/101) (only C30 with Mass movement sensor module (MMS) (7/122), 7/158), alternatively ultrasonic sensor module (IMS) (7/199)) Manipulation guard (only C30 with Mass movement sensor module (MMS) (7/122, 7/158), alternatively ultrasonic sensor module (IMS) (7/199))	Alarm indicator to display the alarm status (7/12) Voltage supply to Mass movement sensor module (MMS) (7/122, 7/158) alternatively ultrasonic sensor module (IMS) (7/199). Ground connection to Mass movement sensor module (MMS) (7/122, 7/158) alternatively ultrasonic sensor module (IMS) (7/199). Power supply to LED (3/174), to indicate the reduced alarm function Power supply to the siren control module (SCM) (16/35).
Via serial communication:	Via serial communication:
Communication with Mass movement sensor module (MMS) (7/122, 7/158) alternatively ultrasonic sensor module (IMS) (7/199) (only the V50/C70 has rear Mass movement sensor module (MMS)).	Communication with Mass movement sensor module (MMS) (7/122, 7/158) alternatively ultrasonic sensor module (IMS) (7/199) (only V50/C70 has rear Mass movement sensor module (MMS)) (Ultrasonic sensor module (IMS) replaces one or several Mass movement sensor modules (MMS) from and including 2012 for the S40, V50 and C30).
Via serial communication (LIN):	Via serial communication (LIN):
Siren control module (SCM) (16/35) for information regarding siren status Remote receiver module (RRX) (4/103) with unlock commands (does not apply to vehicles with the keyless entry system).	Siren control module (SCM) (16/35) for alarm function trigger commands.
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Keyless vehicle module (KVM) (4/93) with information about the key check (only vehicles with the keyless entry system) Accessory electronic module (AEM) (4/78) (only for the Israeli market) Phone Module (PHM) (16/60) when using Volvo On Call services.	The driver information module (DIM) (5/1) receives information about which message is to be displayed Accessory electronic module (AEM) (4/78) (only for the Israeli market) Phone Module (PHM) (16/60) when using Volvo On Call services.

KEYLESS VEHICLE MODULE (KVM) (4/93) (ONLY VEHICLES WITH THE KEYLESS ENTRY SYSTEM)

Input signals	Output signals
Via serial communication:	Via serial communication:
Remote keyless entry (RKE) receiver (4/103), using signals from the remote control.	Remote keyless entry (RKE) receiver (4/103) for configuration.
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56) with the request for a key check.	Central electronic module (CEM) (4/56) with the result of a key check.

Fig 1: Identifying CEM & Components

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying KVM & Components

Courtesy of VOLVO CARS CORPORATION